Lock



'0 drops in front'of the stationary post q and holds the clogging-bolt so that it will be retract the bolt by engaging the abutment v of the dogging-bolt.

In order to make this style of doggingbolt effective in a latch bolt which opens simply by pushing or pulling the door, it is necessary to have dog-setting devices which can be set automatically to shoot the locking bolt on when the door closes although the dogging bolt has been temporarily released to permit one to push or pull the door open. These dog-setting devices comprise 'a two-arm trip y pivoted to the post .2. A torsional spring. 1 tends to keep the pin 2 in the bottom of the slot 3 in the connecting arm l attached to the crank 5 bent into the end of the rod 6 rotatably supported in the rib 7. On the face of the lock (Fig. 10) is a button 8 fastened to the end of the rod 6. This buttonmay be swung through the segmental recess 9 in the face of the face plate.

When the button is in the position shown in Fig. 10, the trip is set. The crank is turned to its upper position which draws the connecting arm up and sets the upper arm of the trip in the path of the cam 10 on the end of the upper bolt guide rod Hence when the door slams shut this cam 10 carries the trip up, which acts as a bell crank lever and through its lower arm 11 engages the projection 12 on the upper side of the tumbler. This lifts the tumbler looking lug o from behind the post 9 and the spring 1t shoots the dogging-bolt in behind the latch roller or head 2'. Now obviously as long as the button remains in the same position the trip will always be set although one enters the building from the outside andtemporarily releases the dogging-bolt so that he can push or pull the door open.

Nevertheless as soon as the door is again slammed shut the trip automatically comes into play to shoot the dogging-bolt. The same operation occurs when one passes through the door from the inside to the outside. 7

On the other hand, when the trip is OK due to shifting of the dog-setting button 8 to the right in'Fig. 10, one may still place the dogging-bolt against the latch head either by the thumb turn on the inside or by the cylinder lock on the outside. When he releases the dogging-bolt the cloggingbolt is released for good until the tripsetting button 8 is again placed.

What I claim is:

1. In a lock, the combination of a housing, a latch-bolt slidable therein, a doggingmember provided with a tumbler for holding. it .in released position or projected position where it look-s the latch-bolt against retraction, means tending to project the .bolt behind the latch-bolt when the dogging member is released, dog-setting devices.

which can be set to be operated by the latchbolt to release the tumbler andpermit the dogging-member to shoot in behind the latch-bolt" and means independent of the dog-setting devices for releasing the tumbler. I

2. A lock, having in combination,'a housing, a sliding latch-bolt therein, a doggingmember, means for normally tending to shoot the dogging-member behind the latchbolt to prevent the latchbo1t from being retracted, a tumbler secured to the doggingmember for holding the same in eitherposition of its travel, means for retracting the dogging-member, and dog-setting devices that can be set to betripped by the latch bolt and to trip the tumbler to permit the shooting of the dogging-member behind th latch-bolt when the door is closed.

3. A lock, having in combination, a housing, a sliding latch-bolt, a sliding-doggingmember, means tending to project the dogging-member behind the latch-bolt, a tumbler for holding the dogging-member in either position of its travel, means for tripping the tumbler and retracting the doggingmember, and dog-setting devices including a trip having engagement with the tumbler and in engagement with the latch-bolt when the trip is set whereby the closing of the door serves to move the trip and disengage the tumbler permitting the dogging-member to shoot in behind the latch bolt.

4:- A lock, having in combination, a housing, a sliding latch-bolt, a sliding doggingmember, means for locking the doggingmember .in its retracted position, means yieldingly urging the dogging-member into its forward position to lock the latch-bolt against retraction, and dog-setting devices including a two-arm trip pivotally supported on the lock housing which maybe set to I 7 bring one arm in the path of the latch-bolt and the other arm in engagement with the dogging-member holding means, whereby when the door is closed the latch-bolt operates the trip to release the doggingthe same behind the latch- 

